<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
		<style type="text/css">
			*{
				margin: 0;
				padding: 0;
			}
			html,body{
				width: 100%;
				height: 100%;
			}
			.top_div{
				width: 100%;
				height: 50px;
				background: red;
			}
			.bottom_div{
				width: 100%;
				height: 50px;
				background: red;
				position: absolute;
				bottom: 0;
			}
			.center_div{
				position: absolute;
				width: 100%;
				top: 50px;
				bottom: 50px;
				background: yellowgreen;
				overflow-y: auto;
			}
			.center_div_cen{
				width: 100%;
				height: 1000px;
			}
			
		</style>
	</head>
	<body>
		<div class="top_div"></div>
		<div class="center_div">
			<div class="center_div_cen">
				<ul>
					<li>1</li>
					<li>2</li>
					<li>3</li>
					<li>4</li>
					<li>5</li>
					<li>6</li>
					<li>7</li>
					<li>8</li>
					<li>9</li>
					<li>10</li>
					<li>11</li>
					<li>12</li>
				</ul>
			</div>
		</div>
		<div class="bottom_div">
			<input type="tel" onclick="sr(this);" onblur="kickBack()"/>
		</div>
	</body>
	<script type="text/javascript">
		
function kickBack() {
  setTimeout(() => {
    window.scrollTo(0, document.body.scrollTop + 1);
    document.body.scrollTop >= 1 && window.scrollTo(0, document.body.scrollTop - 1);  
  }, 10)
}

	</script>
</html>
